The Diocese of Brooklyn has proposed closing 14 elementary schools at the end of the current academic year, a plan that would mean that one of the nation’s largest Catholic dioceses would have shuttered nearly 40 percent of its grade schools in the past seven years.

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Father Joseph Tizio, pastor of Our Lady of Perpetual Help in Brooklyn, told parents on Monday of plans to close the school.

The proposed closings and mergers, announced on Monday, are the latest retrenchment for a school system that was once a bedrock of neighborhood stability, and a magnet for families of many creeds and homelands seeking safe, reliable education at a relatively modest cost.

The news, passed along at midday to principals of schools from Flushing, Queens, to Bay Ridge, Brooklyn, shook students, parents and teachers, many of whom had joined in desperate fund-raising efforts in recent months to avoid the ax. In a well-publicized process that began in September, diocesan officials had been scrutinizing the finances and neighborhood dynamics of its 109 elementary schools to determine which areas might no longer be able to support a school.

Some accepted the decision with resignation.

“The community has already disappeared,” said Harry Connell, picking up his grandson Monday at one of the schools proposed for closing, Our Lady of Perpetual Help in Sunset Park, a Brooklyn neighborhood where the population has gradually shifted toward Asian and Hispanic immigrants who have not sent their children to parochial schools in the same numbers as the white residents they have replaced.

Likening himself to a passenger on the Titanic, Mr. Connell said: “You’ve already hit the iceberg, and you’re on Deck 3 or 4, and you’re just waiting for the lifeboat.”

The Brooklyn diocese, with 1.5 million Catholics in Brooklyn and Queens, is still the fifth most populous in the United States. But while there are pockets across the country  some suburbs and parts of the Southwest  where Catholic education still prospers, schools in urban areas like Brooklyn have heard bad tidings for decades.

Where its parish schools once anchored the neighborhoods from which they drew students, changing demographics have made filling those schools more difficult. Though many new arrivals in the neighborhoods are Catholic, they tend to be poorer than those who have moved on, and less able to afford the average $3,500 tuition at the diocese’s elementary schools, officials say. The presence of public charter schools has also been cited as a factor in the decline of parochial schools.

As a result, enrollment in the grade schools has dropped to about 35,000 from 55,000 since 1998. While the average vacancy rate is 15 percent, some schools have student gaps of another order: Blessed Sacrament School in Jackson Heights, Queens, one of those slated to close, once had 2,500 pupils; its enrollment today is 180.

Meanwhile, the cost of running the system has ballooned. Priests and nuns, once the low-cost heart of the instructional corps, have largely been replaced with comparatively high-cost lay teachers.

Diocesan officials emphasized that the proposed closings were still under review and would not be made final until the end of February by Bishop Nicholas A. DiMarzio, who is scheduled to hold meetings with parents and then with school administrators.

Officials were reluctant to discuss the impact the closings would have on the faculty. Auxiliary Bishop Frank Caggiano, who is leading the reorganization effort, said that prior school closings have generally led to some job losses, but that “80 percent of our teachers have been able to find other positions” in diocesan schools, in part because of retirements.

The Brooklyn diocese closed 25 schools in 2005, and seven more in the next two years.

The new proposals are part of a larger five-year plan, called “Preserving the Vision,” that would include new emphasis on fiscal management. A new tax on each parish would raise about $3 million over the five years of the plan  an amount that would go to offsetting school deficits that routinely approach a total of $1 million a year, and are now made up by subsidies from the diocese.

Bishop Caggiano said the fiscal stability of the schools was crucial, not only for the obvious reasons but for the long-term prospects of Catholic education.

“If you know that a school is going to be here, is on solid footing for the future, you are far more likely to enroll your child in that school,” he said.

But on Monday, many whose schools were slated to close found little consolation in that.